MOS8_030
Well-known member
After the recent revival of my Lisa 2/5 I decided to drag out the Mac512K with the General Computer HyperDrive.
I picked this up at Goodwill back in the '90's. (1996 if I can believe the file dates on the HD. That's all I have to go on.)
I think I paid $120 for it maybe. (That may be what paid for the Lisa, I just don't remember.)
Interestingly, based on the serial number this system started its life as a 128k but the badging on the back says 512 and it has a 512K MB.
But who knows, maybe the original owner had it upgraded when the HyperDrive was installed.
It was working and I thought it was kinda cool. I knew it must have cost a fortune when it was new.
Anyway, after messing with it a bit I put it away and it's been sitting since '97 or so.
So I pulled it out and tried to fire it up last week. The mac booted up ok but the HD drive wouldn't start up.
Long story short the power supply for the General Computer piggy-back card and the HD was only putting out ~7v or so.
There was nothing visually wrong with it, no leaky caps, etc.
So while I was googling around for info I ran across LuckyBob's forum post here about his Mac Plus with a HyperDrive.
He mentioned using a Meanwell power supply so I got to looking at Meanwell's catalog and after a couple of false starts I discovered that their PT-65B looked like a drop-in replacement for the original Hyperdrive PS.
It was, right down the exact same dimensions!
The only difference was the ground used a spade connector rather than the Molex plug on the input side. The output side pin-outs are the same but flipped.
So after after carefully reassembling everything I held my breath and flipped the switch.
I picked this up at Goodwill back in the '90's. (1996 if I can believe the file dates on the HD. That's all I have to go on.)
I think I paid $120 for it maybe. (That may be what paid for the Lisa, I just don't remember.)
Interestingly, based on the serial number this system started its life as a 128k but the badging on the back says 512 and it has a 512K MB.
But who knows, maybe the original owner had it upgraded when the HyperDrive was installed.
It was working and I thought it was kinda cool. I knew it must have cost a fortune when it was new.
Anyway, after messing with it a bit I put it away and it's been sitting since '97 or so.
So I pulled it out and tried to fire it up last week. The mac booted up ok but the HD drive wouldn't start up.
Long story short the power supply for the General Computer piggy-back card and the HD was only putting out ~7v or so.
There was nothing visually wrong with it, no leaky caps, etc.
So while I was googling around for info I ran across LuckyBob's forum post here about his Mac Plus with a HyperDrive.
He mentioned using a Meanwell power supply so I got to looking at Meanwell's catalog and after a couple of false starts I discovered that their PT-65B looked like a drop-in replacement for the original Hyperdrive PS.
It was, right down the exact same dimensions!
The only difference was the ground used a spade connector rather than the Molex plug on the input side. The output side pin-outs are the same but flipped.
So after after carefully reassembling everything I held my breath and flipped the switch.
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